Displacement measurement apparatus for structure

Abstract

An apparatus includes an acquisition means for acquiring displacement quantity in a time-series manner, the displacement quantity being generated at a measurement part of a structure by the weight of a vehicle that travels on the structure, a detection means for detecting the size of the vehicle that passes through the structure and detecting the type of the vehicle from the size, and a control means for controlling the acquisition means on the basis of the detected type of the vehicle.

The invention claimed is: 
     
       1. A displacement measurement apparatus for a structure, the apparatus comprising:
 a memory containing program instructions; and 
 a processor coupled to the memory, wherein the processor is configured to execute the program instructions to: 
 acquire displacement quantity in a time-series manner, the displacement quantity being generated at a measurement part of the structure by weight of a vehicle that travels on the structure; 
 detect a size of the vehicle that passes through the structure, on a basis of an analysis result of determining whether or not a change pattern of a strength and a direction of wind generated along with passage of the vehicle and that is measured by an anemometer is identical or similar to a reference change pattern that is registered and stored in advance; 
 detect a type of the vehicle from the size; and 
 control acquisition of the displacement quantity on a basis of the detected type of the vehicle. 
 
     
     
       2. The displacement measurement apparatus for the structure according to  claim 1 , wherein the processor is further configured to:
 detect a position and clock time of the vehicle that travels a pre-passage area of the measurement part; and 
 estimate an arrival time at which the vehicle arrives at the measurement part, from a position of the measurement part and the position and the clock time of the vehicle, and 
 the acquisition of the displacement quantity is further controlled on a basis of the estimated arrival time. 
 
     
     
       3. The displacement measurement apparatus for the structure according to  claim 2 , wherein
 the position and the clock time of the vehicle are detected on a basis of a position of a reference point that is set in the pre-passage area and a detection result by a sensor that detects a clock time that the vehicle passes through the reference point. 
 
     
     
       4. The displacement measurement apparatus for the structure, according to  claim 2 , wherein
 estimation of the arrival time includes calculation of a period of time necessary for the vehicle to move from the position of the vehicle to the position of the measurement part at a vehicle speed that is set and stored in advance, and 
 the arrival time is calculated from the calculated period of time and the detected clock time. 
 
     
     
       5. The displacement measurement apparatus for the structure, according to  claim 2 , wherein the processor is further configured to:
 detect speed of the vehicle, and 
 estimation of the arrival time includes calculation of a period of time necessary for the vehicle to move from the position of the vehicle to the position of the measurement part at the detected speed of the vehicle, and 
 the arrival time is calculated from the calculated period of time and the detected clock time. 
 
     
     
       6. The displacement measurement apparatus for the structure, according to  claim 2 , wherein
 the acquisition of the displacement quantity is controlled such that the acquisition is allowed to be performed during a period from a clock time before the arrival time by a certain period of time to a clock time after the arrival time by the certain period of time. 
 
     
     
       7. The displacement measurement apparatus for the structure, according to  claim 2 , wherein
 the acquisition of the displacement quantity is controlled such that an error in the arrival time is calculated, and the acquisition is allowed to be performed during a period from a clock time before the arrival time by the error to a clock time after the arrival time by the error. 
 
     
     
       8. A displacement measurement apparatus for a structure, the apparatus comprising:
 a memory containing program instructions; and 
 a processor coupled to the memory, wherein the processor is configured to execute the program instructions to: 
 acquire displacement quantity in a time-series manner, the displacement quantity being generated at a measurement part of the structure by weight of a vehicle that travels on the structure; 
 detect a size of the vehicle that passes through the structure, on a basis of an analysis result of determining whether or not a strength of wind generated along with passage of the vehicle and that is measured by an anemometer exceeds a threshold that is set and stored in advance; 
 detect a type of the vehicle from the size; and 
 control acquisition of the displacement quantity on a basis of the detected type of the vehicle.